Human sources come principally from the burning of fossil fuels such as coal, oil and gas.
He just wants to provide an alternative to the world's diminishing reserve of fossil fuels.
With fossil fuels once again expensive, Cohen's facility with the technology is in demand.
Meanwhile, the underlying fossil fuels are probably as cheap as they are ever going to get.
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Solar will be as cheap as fossil fuels before long, both PV and solar thermal.
Cheap fossil fuels are also undermining efforts to develop and adopt renewable energy.
Fossil fuels are bad, at least if you subscribe to the global warming theory.
"The first place to start is to stop putting public money towards fossil fuels, " he adds.
They hunger for electricity, which in the U.S. comes predominantly from burning fossil fuels.
Both rely heavily on coal, which is the most carbon-intensive of all the fossil fuels.
The irony is that the rise in renewable energy will require more fossil fuels.
At the moment Turkey's energy sector is dependent on dirty, expensive fossil fuels, which are imported.
By some estimates, methane hydrates contain more energy content than all other known fossil fuels combined.
Regardless of how they are transported, fossil fuels contribute to climate change when they're burned.
We're using newer, riskier technologies to extract the last of the Earth's hardest-to-get fossil fuels.
But the basic philosophy is once again to make domestic fossil fuels more profitable.
Since then, Japan has been reliant on imported fossil fuels to meet its energy needs.
The age of fossil fuels is over, and the carmakers will die if they don't adapt.
Greenhouse gases, which come mainly from burning fossil fuels, are thought to cause rising temperatures.
But China is making considerable efforts to boost the amount of energy produced by non-fossil fuels.
The government is trying to curb the use of fossil fuels and promote renewable energy.
These problems are beyond their costs, which are many times the cost of fossil fuels.
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Supplanting fossil fuels with biofuels has, with good reason, emerged as a prime candidate.
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But each of these fossil fuels that we use have some problems, particularly with pollution.
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The fossil fuels are betting on one horse while the renewable fuels are praying for another.
Which is, are we going to be better off without climate change or without fossil fuels?
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But the use of fossil fuels also has benefits: as anything and everything has benefits.
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It's expected to double by midcentury, and most of the growth will be in fossil fuels.
The real challenge is to get green energy that is cheaper than fossil fuels.
And it does indeed subsidise the use of fossil fuels in a very large way.
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